Nut-lock.



C. R. ERVIN.

NUT LOCK.

APPLLCATION FILED MAY 20. 191a. I

Patented Dec. 31, 1918.

g UNITED STATES PATENT OFFICE- the nut.

To all whom it may concern:

Be it known that I, CHARLES R. Erwin, a citizen of the United States,residing at Cushing, in the county of Payne and State of Oklahoma, haveinventednew and'useiful Improvements in Nut-Locks, of whichAnotherobiect is the provision of a nut lock of this character providedwith means whereby the pawl may be moved out of engagement with theratchet washerwhereby the nut may be removed. I

With these and other objectsand advantages inview, such as simplicity,comparative inexpensiveness, efficiency, dura-' Fig. 4. is a crosssectional view on the same line, lookingin the opposite (llI'eCtlOn,

and a Fig. 5 is a detail cross sectional view through the nut, on theline 55 of Fig. 4. Referring more particularly to the drawings, thenumeral 5 designates a bolt which is provided with a groove or keyway 6.Disposed upon the bolt .5is a washer 7 having a hole therein for thepassage of the bolt, and provided with a tongue .8 engaging within thegroove 6 in the bolt. The

outer face of the washer 7 has formed therein in any desired manner, aplurality of circumferentially arranged ratchet teeth 9..

preventing the unscrewing of cHAnLEs n; nnvmfor CUSHING, OKLAHOMA.

' The nutis designated by the numeral 10 and is provided with a centralhole threaded on its inner periphery for engagement upon the threadedend of the bolt 5. The face of the nut engaging against the washer 7 isprovided with a recess 11 with which communicates a bore 12. A pawlmember comprisingia head 13 is associated with the nut with the head 13disposed within the recess 11 and has. its shank. disposed within thebore 12 and extending outwardly beyond the edge of the nut, its terminalbeing provided with a head 15 angular in conformation. The head 13 ofthe pawl member is more clearly shown in Fig. 5 and has its hooklikeendurged outwardly away from'the bottom of the recessll by means of a pad16 of rubber.

My device is used bv sliding the washer 7 onto the bolt 5 and thenscrewing the nut 10 onto th bolt in the usual manner. When the nut 10 isscrewed tight against the washer 7 'the pawl member will pass idly overthe. te th 9 on the washer. as will be obvious. However. in the event ofan attempt to iinscrew the put. the edge 17 of the boss portion of thehead 13 will eng ge against the teeth 9 and have a cam action thereon whch will resultin tending to swin the head 13 so that its hook-like endwill I e gage within the tee h 9. The rubb r ad 16 is merely anauxiliary in accomplishing t is action and mav be omittedif d sired.

If. however. the nut need to be removed, the h ad 15 on the hank of thep wl mem ber mav be grasped with a pa r of pliers or s milar dev ce a dturned so that th hookl ke end oi the head 13 will be forced into therecess 11 to i s maximum exte t so as to be entirely out of proximity tothe t th 9 andso that th cam edge 17 of the head will be out ofengagement with the t eth 9, whereupon the nut may be readily unscrewed.y

From t e foregoing descri tion and a NUT-Loon. u

Specification of Letters Patent. V Patented Dec. 31,1918;

Application filed May 20, 1918. 7 Serial No. 235,555. g

studv of the drawing. it will be apparent series ofratehet teeth; a mit'threadedhpon normally "engaging said" ratchet teeth, said the bolt andprovided with a lateral bore shankbeing provided with a tool engagingcommunicating with a recesein its,- facead head,whereby said pa wl-maybe rotated out 10 jacent the washer, and a pawl member irr of engagementwith said teeth.

eluding a shank revoluble through"saidlgbore o In testir'nony'where'of Iafiix-my signature. and a head portion carried by said shank V anddisposed Within saidrecessin position 7 CHARLES copies of this patentmay be 'ohtained forfive ce'nflse'a'lchby ad dresb'iiig the Commissionerof Patenu. i. 1 was hingtozgc.

